Wet Sand flows better than dry sand

Details Wet Sand flows better than dry sand Wet Sand flows better than dry sand

2007-11-19

arxiv.org/abs/0711.2972v1

Physics

Condensed Matter

Statistical Mechanics

5 pages and 5 figures

Scientific paper

We investigated the yield stress and the apparent viscosity of sand with and without small amounts of liquid. By pushing the sand through a tube with an enforced Poiseuille like profile we minimize the effect of avalanches and shear localization. We find that the system starts to flow when a critical shear of the order of one particle diameter is exceeded. In contrast to common believe, we observe that the resistance against the flow of wet sand is much smaller than that of dry sand. For the dissipative flow we propose a non-equilibrium state equation for granular fluids.

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